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NVIDIA/AMD Vulkan ICDs refuse to *advertise* an HDR color space for a surface on an
IddCx indirect/virtual display, so Vulkan games (Doom: The Dark Ages, id Tech, Indiana
Jones, …) report "device does not support HDR" — even though Windows HDR, DWM compose,
and the client PQ stream all work, and the ICD happily *accepts + presents* a forced HDR
swapchain there. The whole gap is enumeration; the community (Apollo/Sunshine/VDD) wrote
this off as kernel-side / unfixable.
Add VK_LAYER_PUNKTFUNK_hdr_inject (packaging/windows/pf-vkhdr-layer/): a standalone
cdylib Vulkan implicit layer that appends {A2B10G10R10, HDR10_ST2084} + {RGBA16F, scRGB}
to vkGetPhysicalDeviceSurfaceFormats[2]KHR (no need to hook vkCreateSwapchainKHR — the
ICD doesn't validate the color space there). Self-gated on the surface monitor's actual
advanced-color state (DisplayConfig GET_ADVANCED_COLOR_INFO), so it is a complete no-op
on SDR sessions and real monitors (dedup). Always-on (registry-discovered) so it works
regardless of how a game is launched — env-scoping silently fails for already-running
Steam. Escape hatches: DISABLE_PF_VKHDR, PF_VKHDR_EXCLUDE, and a built-in kernel-anti-
cheat denylist.
The installer builds/signs/stages it and registers it under
HKLM64\SOFTWARE\Khronos\Vulkan\ImplicitLayers (opt-out "Install the HDR Vulkan layer"
task); windows-host CI fmt+clippy-gates it (msvc-only FFI).
Live-validated on the RTX box: Doom: The Dark Ages enables HDR over the pf-vdisplay
virtual display.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
111 lines
5.0 KiB
Markdown
111 lines
5.0 KiB
Markdown
# Windows service (deployment)
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The `PunktfunkHost` Windows service is the end-user way to run the host on Windows. It replaces the
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manual bring-up chain (a scheduled task → `PsExec64 -s -i 1` → `wscript launch.vbs` → `host-run.cmd`)
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with one command, auto-start on boot, and supervision.
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## Install (installer — recommended)
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Download the signed installer from the package registry
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(`punktfunk-host-windows`, <https://git.unom.io/unom/-/packages>) and run it (it elevates itself):
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```
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punktfunk-host-setup-<ver>.exe # wizard
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punktfunk-host-setup-<ver>.exe /VERYSILENT # unattended
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```
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It lays the host into `C:\Program Files\punktfunk`, optionally installs the bundled **SudoVDA**
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virtual-display driver, then runs `service install` + `service start` for you. Upgrades stop the
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service first and re-point it; uninstall (Add/Remove Programs) runs `service uninstall`. Packaging
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details: [`packaging/windows/README.md`](../packaging/windows/README.md). A self-signed CI build also
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publishes a `.cer` — import it once (`Import-Certificate -FilePath punktfunk-host-windows.cer
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-CertStoreLocation Cert:\LocalMachine\TrustedPublisher`) so Windows trusts the signed setup.
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## Install (manual / CLI)
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From an **elevated** (Administrator) prompt:
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```powershell
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punktfunk-host service install # register auto-start LocalSystem service + firewall rules + default host.env
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punktfunk-host service start # start it now (also starts automatically on every boot)
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```
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`service install` is idempotent — run it again after upgrading the exe to re-point the service at the
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new binary. Register whatever location you keep the exe in (e.g. `C:\Program Files\punktfunk\`); the
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service records the current exe path.
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Other subcommands:
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```powershell
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punktfunk-host service stop
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punktfunk-host service status
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punktfunk-host service uninstall # stop + delete the service + remove its firewall rules
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```
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## How it works
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The host must run **as SYSTEM in the interactive session** (Session 1+): Desktop Duplication of the
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secure desktop (UAC / lock / login) and `SendInput` need SYSTEM, and capture/injection need the
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interactive session, which a plain Session-0 service is not in.
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So the service (itself in Session 0) **never captures**. On start, and whenever the active console
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session changes, it:
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1. resolves the active console session (`WTSGetActiveConsoleSessionId`),
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2. duplicates its own LocalSystem token and retargets it to that session (`SetTokenInformation`
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`TokenSessionId`),
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3. launches the host there with `CreateProcessAsUserW` (`lpDesktop = winsta0\default`),
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4. supervises it: relaunches on exit/crash (with backoff) and on a console connect/disconnect.
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A kill-on-close **job object** ensures a service crash never orphans the SYSTEM host. The host in turn
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spawns the WGC helper into the *user* session (see [`windows-secure-desktop.md`](windows-secure-desktop.md))
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— two nested launches. Lock/unlock are handled inside the host (the `DesktopWatcher` DDA↔WGC mux), so
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the service deliberately does **not** relaunch on lock/unlock — only on a real session switch.
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This is the same model Sunshine/Apollo use.
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## Configuration
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Config lives in **`%ProgramData%\punktfunk\host.env`** (KEY=VALUE lines, `#` comments). `service
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install` writes a default if none exists. Template: [`scripts/windows/host.env.example`](../scripts/windows/host.env.example).
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```ini
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PUNKTFUNK_ENCODER=nvenc
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PUNKTFUNK_VIDEO_SOURCE=virtual
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PUNKTFUNK_SECURE_DDA=1
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RUST_LOG=info
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# PUNKTFUNK_HOST_CMD=serve --gamestream # the host subcommand the service launches (default: native + Moonlight)
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```
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The service loads these into its environment and carries `PUNKTFUNK_*` + `RUST_LOG` to the host child
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(the same env-merge the WGC helper uses). Restart the service after editing:
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```powershell
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punktfunk-host service stop; punktfunk-host service start
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```
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The host's identity (cert/pairing/mgmt token/library) also lives under `%ProgramData%\punktfunk` — a
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machine-wide dir the SYSTEM service and the interactive user share, surviving user logout.
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`PUNKTFUNK_CONFIG_DIR` overrides the location (both platforms; handy for tests).
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## Logs
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- `%ProgramData%\punktfunk\logs\service.log` — the service's own supervision log (spawn/exit/session
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switches).
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- `%ProgramData%\punktfunk\logs\host.log` — the host child's stdout/stderr.
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## Prerequisites
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- The host built with `--features nvenc` for NVENC (the driver ships `nvEncodeAPI64.dll`; no SDK
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needed at runtime). Software encode otherwise.
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- The **SudoVDA** indirect display driver installed (for `PUNKTFUNK_VIDEO_SOURCE=virtual`).
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- **ViGEmBus** for virtual gamepads (optional).
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## Gotchas
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- `service install`/`uninstall` need an **elevated** prompt (the SCM rejects non-admin).
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- `service run` is the SCM entry point — don't run it by hand (it errors with a hint).
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- A **graceful** stop currently `TerminateProcess`es the host, so its RAII teardown (SudoVDA monitor
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REMOVE) doesn't run; a stale virtual monitor can linger until the next start. A cooperative-stop
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signal is a follow-up.
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